kerlo -ker- gismu

x1 is a/the ear [body-part] of x2; [metaphor: sensory apparatus, information gathering].

(adjective:) x1 is aural. See also kanla, savru, smaji, tirna, ractu.

In notes:

kanla
x1 is a/the eye [body-part] of x2; [metaphor: sensory apparatus]; (adjective:) x1 is ocular.
ractu
x1 is a rabbit/hare/[doe] of species/breed x2.
savru
x1 is a noise/din/clamor [sensory input without useful information] to x2 via sensory channel x3.
smaji
x1 (source) is quiet/silent/[still] at observation point x2 by standard x3.
tirna
x1 hears x2 against background/noise x3; x2 is audible; (adjective:) x1 is aural.
bafcolkercrakre
x1=b1 are sideboards/sideburns/tufts of hair under temple of x2=kerf2=kerl2=c3.
kerlakse
l1 is earwax/cerumen.
kernerbo'o
n1=b1 is an eardrum (tympanic membrane) of n2=k2.
kerza'u
k1=z1 is an earlobe of k2=z2.
latkerlo
x1 is a cat ear of x2
lorkerlo
x1 is a fox ear of x2
selctebi
x1 is an orifice, with lip x2, of body x3.
xadyca'o
x1=c1 is an orifice of anatomical structure [tract] x2=c2 in the body of organism x3=xa2.